Method of making suspension insulators of glass



June 16, 1925.

E. SCHOTT METHOD OF MAKING SUSPENSION IN SULATORS OF GLASS Filed Feb. 6, 1925 body. is at first Patented June 16, 1925.

UNITED STATES PATENT oF lca.

ERICK SCHOTT, OF JENA, GERMANY, ASSIGNOR TO THE FIRM JENAEB GLASWERK SCHOTT- & GENE, OF JENA, GERMANY.

- METHOD OF MAKING SUSPENSION INSULATOBS OF GLASS.

Application filed February 8, 1925. Serial No. 7,438.

. To all whom it may concern: 1

Be it known that I, Enron SoHor'r, a citizen of Germany, and residing. at Jena, Germany, have invented a new and useful 5 Method of Making; Suspension Insulators of Glass (for which in Germany February 9, 1924),

the following is a specification. I The subject of the present invention is a have filed an application of which method of making suspension insulators of glasswhich are" rovided with a clapper, engaging with at ickened end in the glass body. The invention therefore relates to that kind of insulators in which, after their I completion, it is impossible to pull outagain the clapper without the'necessity of cementin or. screwing it into the glass body. According to the invention such insulators are'made in the following way. The glass formed in-such a manner as to receive a hollow space into which the clapper can be inserted with its thickened en Thereupon one inserts the clapperand presses the glass round the 'cla per in such a way that it will beimpossib e to pull it out again from the hollow space after the glass has becomehard. With the method according to theinvention the lass body is therefore rou htinto its fined shape in two separate wor ing periods, whilst when n using glass for makmgthe insulator body one is tempted to bring this body into this shape by a single working process by putting the clapper from the outset into the press mould and b then firmly pressing the glass round it.

to the invention has the particular advantage over the aforesaid other method that with the former it is easily possible to leave a more or less large interval between the glass body and the clapper, so as to be able liollowspace, owever, the method according.

to avoid in a simple way any objectionable influences of the cla per upon the glass body, which may possi ly arise owing to changes of temperature. If, however, the glass is pressed round the clapper in the press mould, owing to the firm. pressing of the glass there may easily arise undesirable tensions in the glass or cracks which considerably reduce both the mechanical and electric firmness of the insulator.

In the annexed drawing the method'aci cording to thepresent invention shallv be elucidated. Fig.,l shows in a cross section an insulator in a preliminarily pressed state;

Fig. 2 represents likewise in a cross section the same insulator in its final shape.

As may be seen, the insulator is provided in its preliminarily pressed state with a hol" low space a which is of uniform width for its whole length, so that the thickened end of a clapper, shown in .Fig. and denoted by b, can be ushed into the hollow space. In Fig. 2 the clapper b is pushed intothe hollow space a and the lower part c of this space narrowed in such a way that the clapper cannot be pulled out any more. The part of the hollow space a not filled up by the clapper, is suitably filled with a soft material, e. g'., cement or the like which is not shown in the drawing. I claim: l r

I Method of making suspension insulators of glass, consisting in this that a glass body is first shaped in such a way as to receive a adapted to receive a clapper, that thereupon a clapper is inserted and finally the glass is pressed round the clapper, so that after the hardenin of the lass the said clapper cannot be pu led out rom the said hol ow space.

. ERICH SCHOTT.

1 by dotted lines l 

